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Genetics of Leaf Rust Resistance in Three Western Canada Spring Wheats. J. A. KOLMER, Research Scientist, Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, R3T 2M9 Canada. Plant Dis. 78:600-602. Accepted for publication I February 1994. Copyright 1994 The American Phytopathological Society. DOI: 10.1094/PD-78-0600.

The wheat cultivars Laura, Biggar, and Genesis have recently been licensed and released for production in western Canada. These cultivars all have effective resistance to the wheat leaf rust fungus, Puccinia recondita f. sp. tritici. The objective of this study was to identify the leaf rust resistance genes in these cultivars. The three cultivars were crossed with the leaf rust-susceptible cultivar Thatcher and also with near-isogenic lines of Thatcher with known leaf rust resistance genes. Segregation of F3 lines in an artificially inoculated rust nursery indicated that Laura has the adult plant gene Lr34. The seedling resistance genes Lrl and LrlO were also identified in Laura. Segregation of F3 lines indicated that the adult plant gene Lr13 was in Genesis and Biggar. A second adult plant gene was also identified in Biggar. Genesis and Biggar were determined to have the seedling resistance gene Lr14a.

Keyword(s): specific resistance, Triticum aestivum